Răspuns :
1/5+3/5x7/9+1,(2)+2 1/9
1/5+3/5x7/9+11/9+19/9=
1/5+21/45+11/9+19/9=
9/45+21/45+11/9+19/9=
30/45=6/9
6/9+11/9+19/9=
17/9+19/9=
36/9=4/1=4
1/5+3/5x7/9+11/9+19/9=
1/5+21/45+11/9+19/9=
9/45+21/45+11/9+19/9=
30/45=6/9
6/9+11/9+19/9=
17/9+19/9=
36/9=4/1=4